is anyone's else iPad Air running fairly warm? I just picked mine up off the charger and the back is really warm. It feels like I left the iPad in the sun for several hours. Screen brightness is at about 75% with the display to turn of after 5 minutes. However, while on the charger it hasn't been used at all. Is the a common issue in iPads? I would be a bit worried about giving the iPad to a small child at this temperature.